[
https://issues.apache.org/jira/browse/RATIS-983?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Shashikant Banerjee updated RATIS-983:
--------------------------------------
Summary: Check follower state before ask for votes (was: Check follower
status before ask for votes)
> Check follower state before ask for votes
> -----------------------------------------
>
> Key: RATIS-983
> URL: https://issues.apache.org/jira/browse/RATIS-983
> Project: Ratis
> Issue Type: Improvement
> Reporter: runzhiwang
> Assignee: runzhiwang
> Priority: Major
> Time Spent: 20m
> Remaining Estimate: 0h
>
> 1. There are server s0, s1, s2, all start leader election. But s2 has not
> start askForVotes.
> {code:java}
> 2020-06-21 03:46:27,958 [Thread-7] INFO impl.RoleInfo
> (RoleInfo.java:updateAndGet(143)) - s0: start LeaderElection
> 2020-06-21 03:46:27,963 [s0@group-D88B65C78887-LeaderElection1] INFO
> impl.LeaderElection (LeaderElection.java:askForVotes(206)) -
> s0@group-D88B65C78887-LeaderElection1: begin an election at term 1 for -1:
> [s0:0.0.0.0:40443, s1:0.0.0.0:46669, s2:0.0.0.0:41589], old=null
> {code}
> {code:java}
> 2020-06-21 03:46:27,990 [Thread-8] INFO impl.RoleInfo
> (RoleInfo.java:updateAndGet(143)) - s1: start LeaderElection
> 2020-06-21 03:46:27,998 [s1@group-D88B65C78887-LeaderElection2] INFO
> impl.LeaderElection (LeaderElection.java:askForVotes(206)) -
> s1@group-D88B65C78887-LeaderElection2: begin an election at term 1 for -1:
> [s0:0.0.0.0:40443, s1:0.0.0.0:46669, s2:0.0.0.0:41589], old=null
> {code}
> {code:java}
> 2020-06-21 03:46:28,064 [Thread-9] INFO impl.RoleInfo
> (RoleInfo.java:updateAndGet(143)) - s2: start LeaderElection
> {code}
> 2. s0 was elected as leader
> {code:java}
> 2020-06-21 03:46:28,093 [s0@group-D88B65C78887-LeaderElection1] INFO
> impl.LeaderElection (LeaderElection.java:logAndReturn(61)) -
> s0@group-D88B65C78887-LeaderElection1: Election PASSED; received 2
> response(s) [s0<-s1#0:FAIL-t1, s0<-s2#0:OK-t1] and 0 exception(s);
> s0@group-D88B65C78887:t1, leader=null, voted=s0,
> raftlog=s0@group-D88B65C78887-SegmentedRaftLog:OPENED:c-1,f-1,i0, conf=-1:
> [s0:0.0.0.0:40443, s1:0.0.0.0:46669, s2:0.0.0.0:41589], old=null
> 2020-06-21 03:46:28,093 [s0@group-D88B65C78887-LeaderElection1] INFO
> impl.RoleInfo (RoleInfo.java:shutdownLeaderElection(134)) - s0: shutdown
> LeaderElection
> 2020-06-21T03:46:28.0975768Z 2020-06-21 03:46:28,094
> [s0@group-D88B65C78887-LeaderElection1] INFO impl.RaftServerImpl
> (RaftServerImpl.java:setRole(174)) - s0@group-D88B65C78887: changes role from
> CANDIDATE to LEADER at term 1 for changeToLeader
> 2020-06-21 03:46:28,094 [s0@group-D88B65C78887-LeaderElection1] INFO
> impl.RaftServerImpl (ServerState.java:setLeader(255)) -
> s0@group-D88B65C78887: change Leader from null to s0 at term 1 for
> becomeLeader, leader elected after 474ms
> {code}
> 3. s2 start askForVotes which did not start in step1. Then a new leader
> election happens.
> {code:java}
> 2020-06-21 03:46:28,096 [s2@group-D88B65C78887-LeaderElection3] INFO
> impl.LeaderElection (LeaderElection.java:askForVotes(206)) -
> s2@group-D88B65C78887-LeaderElection3: begin an election at term 2 for -1:
> [s0:0.0.0.0:40443, s1:0.0.0.0:46669, s2:0.0.0.0:41589], old=null
> {code}
> all the log as following:
> {code:java}
> 2020-06-21T03:46:27.9598769Z 2020-06-21 03:46:27,958 [Thread-7] INFO
> impl.RoleInfo (RoleInfo.java:updateAndGet(143)) - s0: start LeaderElection
> 2020-06-21T03:46:27.9637021Z 2020-06-21 03:46:27,963
> [s0@group-D88B65C78887-LeaderElection1] INFO impl.LeaderElection
> (LeaderElection.java:askForVotes(206)) -
> s0@group-D88B65C78887-LeaderElection1: begin an election at term 1 for -1:
> [s0:0.0.0.0:40443, s1:0.0.0.0:46669, s2:0.0.0.0:41589], old=null
> 2020-06-21T03:46:27.9912697Z 2020-06-21 03:46:27,990 [Thread-8] INFO
> impl.FollowerState (FollowerState.java:run(108)) -
> s1@group-D88B65C78887-FollowerState: change to CANDIDATE, lastRpcTime:244ms,
> electionTimeout:243ms
> 2020-06-21T03:46:27.9918514Z 2020-06-21 03:46:27,990 [Thread-8] INFO
> impl.RoleInfo (RoleInfo.java:shutdownFollowerState(121)) - s1: shutdown
> FollowerState
> 2020-06-21T03:46:27.9919033Z 2020-06-21 03:46:27,990 [Thread-8] INFO
> impl.RaftServerImpl (RaftServerImpl.java:setRole(174)) -
> s1@group-D88B65C78887: changes role from FOLLOWER to CANDIDATE at term 0 for
> changeToCandidate
> 2020-06-21T03:46:27.9920005Z 2020-06-21 03:46:27,990 [Thread-8] INFO
> impl.RoleInfo (RoleInfo.java:updateAndGet(143)) - s1: start LeaderElection
> 2020-06-21T03:46:27.9994968Z 2020-06-21 03:46:27,998
> [s1@group-D88B65C78887-LeaderElection2] INFO impl.LeaderElection
> (LeaderElection.java:askForVotes(206)) -
> s1@group-D88B65C78887-LeaderElection2: begin an election at term 1 for -1:
> [s0:0.0.0.0:40443, s1:0.0.0.0:46669, s2:0.0.0.0:41589], old=null
> 2020-06-21T03:46:28.0312909Z 2020-06-21 03:46:28,026 [nioEventLoopGroup-2-1]
> INFO logging.LoggingHandler (AbstractInternalLogger.java:log(148)) - [id:
> 0xeb2e2f1c, L:/0.0.0.0:40443] READ: [id: 0x13e9fc9d, L:/10.1.0.4:40443 -
> R:/10.1.0.4:57104]
> 2020-06-21T03:46:28.0313672Z 2020-06-21 03:46:28,027 [nioEventLoopGroup-5-1]
> INFO logging.LoggingHandler (AbstractInternalLogger.java:log(148)) - [id:
> 0x87dcc8c6, L:/0.0.0.0:46669] READ: [id: 0x9d66979b, L:/10.1.0.4:46669 -
> R:/10.1.0.4:55756]
> 2020-06-21T03:46:28.0348907Z 2020-06-21 03:46:28,034 [nioEventLoopGroup-7-1]
> INFO logging.LoggingHandler (AbstractInternalLogger.java:log(148)) - [id:
> 0xeefdb82d, L:/0.0.0.0:41589] READ: [id: 0xd8486e82, L:/10.1.0.4:41589 -
> R:/10.1.0.4:60724]
> 2020-06-21T03:46:28.0525870Z 2020-06-21 03:46:28,048 [Thread-9] INFO
> impl.FollowerState (FollowerState.java:run(108)) -
> s2@group-D88B65C78887-FollowerState: change to CANDIDATE, lastRpcTime:300ms,
> electionTimeout:300ms
> 2020-06-21T03:46:28.0526704Z 2020-06-21 03:46:28,049 [Thread-9] INFO
> impl.RoleInfo (RoleInfo.java:shutdownFollowerState(121)) - s2: shutdown
> FollowerState
> 2020-06-21T03:46:28.0527414Z 2020-06-21 03:46:28,049 [Thread-9] INFO
> impl.RaftServerImpl (RaftServerImpl.java:setRole(174)) -
> s2@group-D88B65C78887: changes role from FOLLOWER to CANDIDATE at term 0 for
> changeToCandidate
> 2020-06-21T03:46:28.0528112Z 2020-06-21 03:46:28,050 [nioEventLoopGroup-7-1]
> INFO logging.LoggingHandler (AbstractInternalLogger.java:log(148)) - [id:
> 0xeefdb82d, L:/0.0.0.0:41589] READ COMPLETE
> 2020-06-21T03:46:28.0528860Z 2020-06-21 03:46:28,050 [nioEventLoopGroup-7-1]
> INFO logging.LoggingHandler (AbstractInternalLogger.java:log(148)) - [id:
> 0xeefdb82d, L:/0.0.0.0:41589] READ: [id: 0xb6163b29, L:/10.1.0.4:41589 -
> R:/10.1.0.4:60726]
> 2020-06-21T03:46:28.0535812Z 2020-06-21 03:46:28,053 [nioEventLoopGroup-7-1]
> INFO logging.LoggingHandler (AbstractInternalLogger.java:log(148)) - [id:
> 0xeefdb82d, L:/0.0.0.0:41589] READ COMPLETE
> 2020-06-21T03:46:28.0625519Z 2020-06-21 03:46:28,061 [nioEventLoopGroup-5-1]
> INFO logging.LoggingHandler (AbstractInternalLogger.java:log(148)) - [id:
> 0x87dcc8c6, L:/0.0.0.0:46669] READ COMPLETE
> 2020-06-21T03:46:28.0649289Z 2020-06-21 03:46:28,064 [nioEventLoopGroup-2-1]
> INFO logging.LoggingHandler (AbstractInternalLogger.java:log(148)) - [id:
> 0xeb2e2f1c, L:/0.0.0.0:40443] READ COMPLETE
> 2020-06-21T03:46:28.0668601Z 2020-06-21 03:46:28,064 [Thread-9] INFO
> impl.RoleInfo (RoleInfo.java:updateAndGet(143)) - s2: start LeaderElection
> 2020-06-21T03:46:28.0812923Z 2020-06-21 03:46:28,076 [nioEventLoopGroup-8-2]
> INFO impl.RaftServerImpl (RaftServerImpl.java:setRole(174)) -
> s2@group-D88B65C78887: changes role from CANDIDATE to FOLLOWER at term 1 for
> recognizeCandidate:s1
> 2020-06-21T03:46:28.0821817Z 2020-06-21 03:46:28,081 [nioEventLoopGroup-8-2]
> INFO impl.RoleInfo (RoleInfo.java:shutdownLeaderElection(134)) - s2:
> shutdown LeaderElection
> 2020-06-21T03:46:28.0827947Z 2020-06-21 03:46:28,082 [nioEventLoopGroup-8-2]
> INFO impl.RoleInfo (RoleInfo.java:updateAndGet(143)) - s2: start
> FollowerState
> 2020-06-21T03:46:28.0874158Z 2020-06-21 03:46:28,086 [nioEventLoopGroup-8-1]
> INFO impl.RaftServerImpl (RaftServerImpl.java:setRole(174)) -
> s2@group-D88B65C78887: changes role from FOLLOWER to FOLLOWER at term 1 for
> recognizeCandidate:s0
> 2020-06-21T03:46:28.0874951Z 2020-06-21 03:46:28,086 [nioEventLoopGroup-8-1]
> INFO impl.RoleInfo (RoleInfo.java:shutdownFollowerState(121)) - s2: shutdown
> FollowerState
> 2020-06-21T03:46:28.0875242Z 2020-06-21 03:46:28,086 [nioEventLoopGroup-8-1]
> INFO impl.RoleInfo (RoleInfo.java:updateAndGet(143)) - s2: start
> FollowerState
> 2020-06-21T03:46:28.0879248Z 2020-06-21 03:46:28,087 [Thread-18] INFO
> impl.FollowerState (FollowerState.java:run(117)) -
> s2@group-D88B65C78887-FollowerState was interrupted:
> java.lang.InterruptedException: sleep interrupted
> 2020-06-21T03:46:28.0920027Z 2020-06-21 03:46:28,090
> [s1@group-D88B65C78887-LeaderElection2] INFO impl.LeaderElection
> (LeaderElection.java:logAndReturn(61)) -
> s1@group-D88B65C78887-LeaderElection2: Election REJECTED; received 2
> response(s) [s1<-s0#0:FAIL-t1, s1<-s2#0:FAIL-t1] and 0 exception(s);
> s1@group-D88B65C78887:t1, leader=null, voted=s1,
> raftlog=s1@group-D88B65C78887-SegmentedRaftLog:OPENED:c-1,f-1,i0, conf=-1:
> [s0:0.0.0.0:40443, s1:0.0.0.0:46669, s2:0.0.0.0:41589], old=null
> 2020-06-21T03:46:28.0920482Z 2020-06-21 03:46:28,090
> [s1@group-D88B65C78887-LeaderElection2] INFO impl.RaftServerImpl
> (RaftServerImpl.java:setRole(174)) - s1@group-D88B65C78887: changes role from
> CANDIDATE to FOLLOWER at term 1 for DISCOVERED_A_NEW_TERM
> 2020-06-21T03:46:28.0920938Z 2020-06-21 03:46:28,090
> [s1@group-D88B65C78887-LeaderElection2] INFO impl.RoleInfo
> (RoleInfo.java:shutdownLeaderElection(134)) - s1: shutdown LeaderElection
> 2020-06-21T03:46:28.0921255Z 2020-06-21 03:46:28,091
> [s1@group-D88B65C78887-LeaderElection2] INFO impl.RoleInfo
> (RoleInfo.java:updateAndGet(143)) - s1: start FollowerState
> 2020-06-21T03:46:28.0969648Z 2020-06-21 03:46:28,093
> [s0@group-D88B65C78887-LeaderElection1] INFO impl.LeaderElection
> (LeaderElection.java:logAndReturn(61)) -
> s0@group-D88B65C78887-LeaderElection1: Election PASSED; received 2
> response(s) [s0<-s1#0:FAIL-t1, s0<-s2#0:OK-t1] and 0 exception(s);
> s0@group-D88B65C78887:t1, leader=null, voted=s0,
> raftlog=s0@group-D88B65C78887-SegmentedRaftLog:OPENED:c-1,f-1,i0, conf=-1:
> [s0:0.0.0.0:40443, s1:0.0.0.0:46669, s2:0.0.0.0:41589], old=null
> 2020-06-21T03:46:28.0975340Z 2020-06-21 03:46:28,093
> [s0@group-D88B65C78887-LeaderElection1] INFO impl.RoleInfo
> (RoleInfo.java:shutdownLeaderElection(134)) - s0: shutdown LeaderElection
> 2020-06-21T03:46:28.0975768Z 2020-06-21 03:46:28,094
> [s0@group-D88B65C78887-LeaderElection1] INFO impl.RaftServerImpl
> (RaftServerImpl.java:setRole(174)) - s0@group-D88B65C78887: changes role from
> CANDIDATE to LEADER at term 1 for changeToLeader
> 2020-06-21T03:46:28.0976322Z 2020-06-21 03:46:28,094
> [s0@group-D88B65C78887-LeaderElection1] INFO impl.RaftServerImpl
> (ServerState.java:setLeader(255)) - s0@group-D88B65C78887: change Leader from
> null to s0 at term 1 for becomeLeader, leader elected after 474ms
> 2020-06-21T03:46:28.0976760Z 2020-06-21 03:46:28,096
> [s2@group-D88B65C78887-LeaderElection3] INFO impl.LeaderElection
> (LeaderElection.java:askForVotes(206)) -
> s2@group-D88B65C78887-LeaderElection3: begin an election at term 2 for -1:
> [s0:0.0.0.0:40443, s1:0.0.0.0:46669, s2:0.0.0.0:41589], old=null
> 2020-06-21T03:46:28.0980726Z 2020-06-21 03:46:28,097
> [s0@group-D88B65C78887-LeaderElection1] INFO server.RaftServerConfigKeys
> (ConfUtils.java:logGet(44)) - raft.server.staging.catchup.gap = 1000 (default)
> 2020-06-21T03:46:28.0982068Z 2020-06-21 03:46:28,097
> [s0@group-D88B65C78887-LeaderElection1] INFO server.RaftServerConfigKeys
> (ConfUtils.java:logGet(44)) - raft.server.rpc.sleep.time = 25ms (default)
> 2020-06-21T03:46:28.1035314Z 2020-06-21 03:46:28,100
> [s0@group-D88B65C78887-LeaderElection1] INFO metrics.RatisMetrics
> (RatisMetrics.java:lambda$create$0(39)) - Creating Metrics Registry :
> ratis.log_appender.s0@group-D88B65C78887
> 2020-06-21T03:46:28.1035877Z 2020-06-21 03:46:28,100
> [s0@group-D88B65C78887-LeaderElection1] WARN impl.MetricRegistriesImpl
> (MetricRegistriesImpl.java:lambda$create$1(61)) - First MetricRegistry has
> been created without registering reporters. You may need to call
> MetricRegistries.global().addReportRegistration(...) before.
> 2020-06-21T03:46:28.1036291Z 2020-06-21 03:46:28,101
> [s0@group-D88B65C78887-LeaderElection1] INFO server.RaftServerConfigKeys
> (ConfUtils.java:logGet(44)) - raft.server.write.element-limit = 4096 (default)
> 2020-06-21T03:46:28.1036789Z 2020-06-21 03:46:28,101
> [s0@group-D88B65C78887-LeaderElection1] INFO server.RaftServerConfigKeys
> (ConfUtils.java:logGet(44)) - raft.server.write.byte-limit = 64MB (=67108864)
> (default)
> 2020-06-21T03:46:28.1063137Z 2020-06-21 03:46:28,104
> [s2@group-D88B65C78887-LeaderElection3] INFO impl.LeaderElection
> (LeaderElection.java:logAndReturn(61)) -
> s2@group-D88B65C78887-LeaderElection3: Election REJECTED; received 0
> response(s) [] and 0 exception(s); s2@group-D88B65C78887:t2, leader=null,
> voted=s2, raftlog=s2@group-D88B65C78887-SegmentedRaftLog:OPENED:c-1,f-1,i0,
> conf=-1: [s0:0.0.0.0:40443, s1:0.0.0.0:46669, s2:0.0.0.0:41589], old=null
> 2020-06-21T03:46:28.1063623Z 2020-06-21 03:46:28,105 [nioEventLoopGroup-2-1]
> INFO logging.LoggingHandler (AbstractInternalLogger.java:log(148)) - [id:
> 0xeb2e2f1c, L:/0.0.0.0:40443] READ: [id: 0xd7a24ea3, L:/10.1.0.4:40443 -
> R:/10.1.0.4:57112]
> 2020-06-21T03:46:28.1090607Z 2020-06-21 03:46:28,106 [nioEventLoopGroup-2-1]
> INFO logging.LoggingHandler (AbstractInternalLogger.java:log(148)) - [id:
> 0xeb2e2f1c, L:/0.0.0.0:40443] READ COMPLETE
> 2020-06-21T03:46:28.1098274Z 2020-06-21 03:46:28,107 [nioEventLoopGroup-5-1]
> INFO logging.LoggingHandler (AbstractInternalLogger.java:log(148)) - [id:
> 0x87dcc8c6, L:/0.0.0.0:46669] READ: [id: 0xdb116403, L:/10.1.0.4:46669 -
> R:/10.1.0.4:55764]
> 2020-06-21T03:46:28.1107308Z 2020-06-21 03:46:28,108 [nioEventLoopGroup-5-1]
> INFO logging.LoggingHandler (AbstractInternalLogger.java:log(148)) - [id:
> 0x87dcc8c6, L:/0.0.0.0:46669] READ COMPLETE
> 2020-06-21T03:46:28.1108298Z 2020-06-21 03:46:28,108 [nioEventLoopGroup-6-2]
> INFO impl.RaftServerImpl (RaftServerImpl.java:setRole(174)) -
> s1@group-D88B65C78887: changes role from FOLLOWER to FOLLOWER at term 2 for
> recognizeCandidate:s2
> 2020-06-21T03:46:28.1109906Z 2020-06-21 03:46:28,108 [nioEventLoopGroup-6-2]
> INFO impl.RoleInfo (RoleInfo.java:shutdownFollowerState(121)) - s1: shutdown
> FollowerState
> 2020-06-21T03:46:28.1110658Z 2020-06-21 03:46:28,109 [Thread-20] INFO
> impl.FollowerState (FollowerState.java:run(117)) -
> s1@group-D88B65C78887-FollowerState was interrupted:
> java.lang.InterruptedException: sleep interrupted
> 2020-06-21T03:46:28.1111310Z 2020-06-21 03:46:28,109 [nioEventLoopGroup-6-2]
> INFO impl.RoleInfo (RoleInfo.java:updateAndGet(143)) - s1: start
> FollowerState
> 2020-06-21T03:46:28.1163725Z 2020-06-21 03:46:28,116
> [s0@group-D88B65C78887-LeaderElection1] INFO server.RaftServerConfigKeys
> (ConfUtils.java:logGet(44)) - raft.server.watch.timeout = 10s (default)
> 2020-06-21T03:46:28.1164839Z 2020-06-21 03:46:28,116
> [s0@group-D88B65C78887-LeaderElection1] INFO server.RaftServerConfigKeys
> (ConfUtils.java:logGet(44)) - raft.server.watch.timeout.denomination = 1s
> (default)
> 2020-06-21T03:46:28.1186640Z 2020-06-21 03:46:28,118
> [s0@group-D88B65C78887-LeaderElection1] INFO server.RaftServerConfigKeys
> (ConfUtils.java:logGet(44)) - raft.server.watch.element-limit = 65536
> (default)
> 2020-06-21T03:46:28.1251657Z 2020-06-21 03:46:28,124
> [s0@group-D88B65C78887-LeaderElection1] INFO server.RaftServerConfigKeys
> (ConfUtils.java:logGet(44)) -
> raft.server.log.appender.snapshot.chunk.size.max = 16MB (=16777216) (default)
> 2020-06-21T03:46:28.1253791Z 2020-06-21 03:46:28,124
> [s0@group-D88B65C78887-LeaderElection1] INFO server.RaftServerConfigKeys
> (ConfUtils.java:logGet(44)) - raft.server.log.appender.buffer.byte-limit =
> 8KB (=8192) (custom)
> 2020-06-21T03:46:28.1259948Z 2020-06-21 03:46:28,125
> [s0@group-D88B65C78887-LeaderElection1] INFO server.RaftServerConfigKeys
> (ConfUtils.java:logGet(44)) - raft.server.log.appender.buffer.element-limit =
> 0 (default)
> 2020-06-21T03:46:28.1291098Z 2020-06-21 03:46:28,128
> [s0@group-D88B65C78887-LeaderElection1] INFO server.RaftServerConfigKeys
> (ConfUtils.java:logGet(44)) -
> raft.server.log.appender.snapshot.chunk.size.max = 16MB (=16777216) (default)
> 2020-06-21T03:46:28.1294354Z 2020-06-21 03:46:28,128
> [s0@group-D88B65C78887-LeaderElection1] INFO server.RaftServerConfigKeys
> (ConfUtils.java:logGet(44)) - raft.server.log.appender.buffer.byte-limit =
> 8KB (=8192) (custom)
> 2020-06-21T03:46:28.1294744Z 2020-06-21 03:46:28,128
> [s0@group-D88B65C78887-LeaderElection1] INFO server.RaftServerConfigKeys
> (ConfUtils.java:logGet(44)) - raft.server.log.appender.buffer.element-limit =
> 0 (default)
> 2020-06-21T03:46:28.1330073Z 2020-06-21 03:46:28,132
> [s0@group-D88B65C78887-LeaderElection1] INFO impl.RoleInfo
> (RoleInfo.java:updateAndGet(143)) - s0: start LeaderState
> 2020-06-21T03:46:28.1442268Z 2020-06-21 03:46:28,143
> [s0@group-D88B65C78887-LeaderElection1] INFO
> segmented.SegmentedRaftLogWorker
> (SegmentedRaftLogWorker.java:startLogSegment(391)) -
> s0@group-D88B65C78887-SegmentedRaftLogWorker: Starting segment from index:0
> 2020-06-21T03:46:28.1676758Z 2020-06-21 03:46:28,163
> [s0@group-D88B65C78887-LeaderElection1] INFO impl.RaftServerImpl
> (ServerState.java:setRaftConf(356)) - s0@group-D88B65C78887: set
> configuration 0: [s0:0.0.0.0:40443, s1:0.0.0.0:46669, s2:0.0.0.0:41589],
> old=null at 0
> 2020-06-21T03:46:28.1716372Z 2020-06-21 03:46:28,167 [nioEventLoopGroup-3-2]
> INFO impl.RaftServerImpl (ServerState.java:setLeader(255)) -
> s0@group-D88B65C78887: change Leader from s0 to null at term 2 for
> updateCurrentTerm
> 2020-06-21T03:46:28.1716975Z 2020-06-21 03:46:28,167 [nioEventLoopGroup-3-2]
> INFO impl.RaftServerImpl (RaftServerImpl.java:setRole(174)) -
> s0@group-D88B65C78887: changes role from LEADER to FOLLOWER at term 2 for
> recognizeCandidate:s2
> {code}
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